please solve question no. 13&15...
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Step-by-step explanation:
13.
Amount of work completed by p persons in p days, working p hours a day = (p/p³) = (1/p²)
Amount of work completed by q persons in q days, working q hours a day =
q³ * 1/p²
= q³/p²
Therefore, the answer is Option(A).
15.
3 men's 1-day work = (1/32)
Then, 1 men's 1-day work = 1/96
7 women's 1-day work = (1/32).
Then, 1 women's 1-day work = (1/224).
Now,
7 men + 5 women
= 7(1/96) + 5(1/224)
= (7/96) + (5/224)
= (2/21).
Total time = (21/2).
Now,
Twice as large = (21/2) * 2 = 21 days.
Therefore, the answer is (B).
Hope it helps!
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